Cayman Systems 2E-H-W, User Manual

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Cayman 2E-H-W User’s Guide Glossary
November 2000
5
encapsulation Technique used to enclose information formatted for one protocol,
such as AppleTalk, within a packet formatted for a different
protocol, such as TCP/IP.
encryption
The application of a specific algorithm to a data set so that anyone
without the encryption key cannot understand the information.
Ethernet crossover cable
See crossover cable.
FCS Frame Check Sequence. Data included in frames for error control.
flow control
Technique using hardware circuits or control characters to regulate
the transmission of data between a computer (or other DTE) and a
modem (or other DCE). Typically, the modem has buffers to hold
data; if the buffers approach capacity, the modem signals the
computer to stop while it catches up on processing the data in the
buffer. See CTS, RTS, xon/xoff.
fragmentation
Process of breaking a packet into smaller units so that they can be
sent over a network medium that cannot transmit the complete
packet as a unit.
frame
Logical grouping of information sent as a link-layer unit. Compare
datagram, packet.
FTP
File Transfer Protocol. Application protocol that lets one IP node
transfer files to and from another node.
FTP server
Host on network from which clients can transfer files.
hardware handshake
Method of flow control using two control lines, usually Request to
Send (RTS) and Clear to Send (CTS).
HDLC
High-level Data Link Control.
HDSL High-data-rate Digital Subscribe Line. Modems on either end of one
or more twisted pair wires that deliver T1 or E1 speeds. T1 requires
two lines and E1 requires three. Compare ADSL, SDSL.
header
The portion of a packet, preceding the actual data, containing
source and destination addresses and error-checking fields.